Automatic reversing starter.



J. HUFLE.

AUTOMATIC REVBRSING STARTER.

APRLIGATION FILED oo'r zz, 1910.

989,847. 7 Patented Apr. 18, 1911.

2 SHEETS-SHEET 1.

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J. H'GPL'E. AUTOMATIC REVERSING STARTER.

APPLICATION FILED OUT. 24,-1910.

Patented Apr. 18, 1911 2 SHEETSSHEET 2.

UNT

JULIUS HCiFLE, 0F BUDAPEST, AUSTRIA-HUNGARY.

AUTOMATIC REVERSING STARTER.

cease Specification of Letters Patent.

Patented Apr. 18, 1911.

Application filed October 24, 1910. Serial No. 588,755.

To all whom it may concern:

Be it known that I, JULIUs Horus, a sub- 'ject of the King of Hungary,residing at the city of Budapest, in the Empire of Austria-Hungary, haveinvented certain new and useful Improvements in Automatic ReversingStarters; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, refcroncebeing had to the accompanying drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

My invention relates to automatic reversing starters comprising fourprincipal parts, namely the change-over switch for determining thedirection of rotation of the motor controlled thereby, theresistance-switch for interposing and cutting out starting resistances,the series circuit breaker and, lastly, the dash-pot for the switchlever of the resistance-switch. According to my invention these fourparts are mechanically so connected together that, firstly, the motorcan only be started with the entire series resistances in circuit, and,secondly, the circuit is broken neither at the change-over switch nor atthe resistance-switch, but only at the series circuit-breaker.Consequently, the attendant has to observe only this one place, as nosparks occur at the others.

The means for reversing the current are new and comprise two concentricsets of segmental contacts, whose ends are so close together that in theoff position of the changeover switch the ends of one concentric set areelectrically connected one with another by contact brushes thereon.Further, it is new to connect the change-over switch by means of a rodwith the switch lever which cuts out starting resistances when startingthe motor, and also it is new to arrange on the resistance-switch lovera projection or lug which opens the series circuit-breaker or allows itto close.

One illustrative embodiment of my invention and two modificationsthereof are represented by way of example in the accompanying drawings,wherein Figure 1 is a front elevation of the starter in the offposition, Fig. 2 a like view of the same in the on position, Fig. 3 is aside elevation of the starter in the position according to Fig. 1, thedash-pot not being shown and Fi 4 a to) .ilan view cone sponding to Fig.1, while Figs. 5, 6 and T are diagrams of connections, Fig. 6 showingthe connection for shunt motors, Fig. 5 the same connection except thata modified change-over switch is shown here, and Fig. 7 shows a modifiedmain switch and resist ance-switch and the diagram of connections forthe three-phase reversing starter.

Referring to the drawings, an insulating slab 2 carrying the pivot 3, onwhich the switch lever 4t carrying a projection or lug 5 and the contactbrush 6 is free to rotate, is mounted on the resistance box 1. Thedriving lever arm 8 which is pivotally connected by the pin 9 with oneend of the connectingrod 10 but insulated from the other end thereof, isfast on the pivot 3.

The series switch-lever 15 is fulcrumed on the pivot 14 mounted on theslab 2 and the spring 13 constantly tends to pull this lever toward thecontact 18 and close the circuit. This lever 15 has a shoulder 15 whichmoves in the track of the lug 5.

The segmental contacts 26, 27 28, 29 are mounted on the lower part ofthe slab 2. The two-armed lever 20 having one arm pivotally connected bythe pin 21 with the connecting-rod 10 is fast on the shaft 19 journaledin the box 1. This lever 20 carries the brush-holders 22, 23, of whichthe holder 23 carries the contact brushes 24 and the holder 22 thecontact brushes 25. These brushes 2 1 and 25 electrically connect theadjacent segmental contacts; the ends of the latter are so near togetherthat in the off position of the switch the same are connected by thesebrushes, so that'should the brushes slide over the ends the circuitcannot be broken.

The lever l loose on the pivot 3 has not only a contact brush 6 movableover contacts 7 connected with the starting resistances, but also a lugcc normally resting against the lug g of the lever 8 (see Fig. 4:) anddescends as soon as the lever 8 moves downward, while it is raised againwhen the lever 8 is rocked upward. In order that the lever 4 may fallslowly and gradually a dash-pot is provided comprising a perforatedcylinder 13 and the piston 12 pivotally connected by the rod 11 with thelever 4, movable therein.

My improved automatic starter operates as follows :When the shaft 19 isrotated by the pulley 30 fast on it, the lever 20 is driven, and rocksthe lever 8 by means of the rod 10 downward, while the brushes 2a and 25simultaneously slide over the contacts 27, 28 and 26, 29, respectively.If the lever is rocked in the other direction the brushes 24: and slideover the segments 26, 28 and 27, 29, respectively. The former position,as shown in Fig. 2, is for causing the motor to run counter-clockwiseand the latter for causing the motor to run in the reverse direction.When the lever 8 moves downward the lug as of the lever 1 is no longersupported, as the lug y descends with the lever 8, and, consequently asthe piston 12 is forced into the cylinder 13, the lever t descendsslowly and moves gradually over the contacts 7. The projection 5 on thelever at is simultaneously removed from the shoulder 5 of the switchlever 15 and the spring 16 pulls this lever against the contact 18,whereby the main circuit is closed.

If the circuit is followed with reference to Fig. 6 it will be seen thatthe current goes from the feeder to the main switch 18, 15, then by wayof the pivot 1-1- to the change-over switch, passing by way of thecontact brush 25 to the contacts 29, 26, thence by way of the pivot 3and switch lever 4, contact brush 6 and by way of the startingresistance E to the armature A and onto the contact 27, through thebrush 2% to the contact 28 and to the ffeeder. The field magnet windingM has one pole connected directly with the feeder and the other with theright-hand inner contact 29 and by way of this with the feeder.

The only difference between Fig. 5 and Fig. (i that in the modificationshown in the former figure the change-over switch comprises twoconcentric circular contacts and two concentric segments, as clearlyshown.

In T R designates the rotor or secondary winding anl S the stator or primary winding of the motor. Two feeders are connected with thedouble-pole main switch 15 connected with the two inner contacts 28, 29,while the third feeder is connected directly to one phase of the stator,the other two phases being connected to the change-over switch. Threesets of starting resistances I, H, 111 are provided for the rotor, onefor each phase; the primary winding is electrically insulated from thesecondary.

I claim 1. In an automatic starter for electric motors, the combinationwith a change over switch revoluble in opposite directions; of a pivotedresistance switch, pivoted means between the resistance switch andchange over switch to operate the former, and a series switchmechanically controlled by the resistance switch.

2. In an automatic starter for electric motors, the combination with achange over switch; of a freely falling pivoted resistance switch, apivoted lever to support the resistance switch, a link pivotallyconnected to the supporting lever and change over switch.

3. In an automatic starter for electric motors, the combination with achange over switch; of a freely falling pivoted resistance switch, meansto retard the fall of said resistance switch, a pivoted lever to supportthe resistance switch, a link pivotally connected to the supportinglever and change over switch.

In an automatic starter for electric motors, the combination with achange over switch; of a freely falling pivoted resistance switch, adash-pot to control the fall of said resistance switch and a linkpivotally connected to the supporting lever and change over switch.

5. In an automatic starter for electric mo tors, the combination with achange over switch; of a freely falling resistance switch, a pivotedlever to support the latter switch, link pivotally connecting thesupporting lever and change over switch, a pivoted spring-urged seriesswitch controlled by the resistance switch and a dash-pot to retard theresistance switch and thereby the series switch.

In testimony that I claim the foregoing as my invention, it have signedmy name in presence of two subscribing witnesses.

JULIUS HOFLE.

lYitnesses FRANZ lii'ianin'rzr, l l'oerr KEMJEUY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

n, n. e."

